[patch, fortran] Make frontend walker more general

[Thomas Koenig]

Hello world,

the current expression walker for front end stuff is not general.

Here's an attempt to make it so.  I have also added a few cases which
were not handled before.

Regression-tested.  No test necessary, because this is only a cleanup.
OK for trunk?

	Thomas

2010-09-11  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* frontend-passes.c (process_functions):  New struct and type.
	(process_namespace):  Rename from optimize_namespace, add
	process_functions * argument.  Call renamed functions.
	Adjust prototype.
	(process_code):  Rename from optimize_code, add
	process_functions * argument.  Call renamed functions.
	Adjust prototype.
	(process_code_node):  Rename from optimize_code_node, add
	process_functions * argument.  Call functions from the
	pass function pointers.  Add code for the EXEC_READ, EXEC_WRITE,
	EXEC_OPEN, EXEC_INQUIRE, EXEC_REWIND, EXEC_ENDFILE,
	EXEC_BACKSPACE, EXEC_CLOSE, EXEC_WAIT.  Adjust prototype.
	(optimize_expr_0):  Return early for NULL expression.
	(optimize_pass):  New struct.
	(gfc_run_passes):  Call process namespace with optimize_pass
	argument instead of optimize_namespace.
	

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